Pump for vacuum-cleaners.



3.1:. SMITH. PUMP FOR VACUUM CLEANERS.

APPLIOATIOH I'ILED IA]. 16, 1912.-

1,038,222. Patented Se t; 10, 1912.

wmmsszs ATTORNEYS Be it. known that I, ROBERT noimnr a smrrn, or PHILA ELPHIA, rnnnsrnvnun. 1

' PUMP FOR VACUUM-CLEANERS.

' Specification of Letters Patent. 7

original application filed January 9, 1912, Serialii'o. 670,208. Divided and this Y 1912. Seria1,No. .6 88,957. a

recanted Sept. 10,1912. application med ljarch 15,

n all whom it may concern:

B. SMITH, a

. citizen of the United States, residing in the cityand -county.,of Philadelphia, State of htl Pennsylvania, have invented a new anduseful Pump for-Vacuum-Cleaners, of-which the followingis aspecification.

In a contemporaneously pendingl appli-i cat-ion filed by me on January 9t 1912, Serial No. 670,208, ofwhich this ap lication is. a division, I have shown an described a novel construction of vacuum cleaner, while the resent invention relates particularly to I the pumping apparatus therefor and comprises a novel construction of a seamless sheet metal pump cylin der formed with an integral head, which is employed in conjunction with a seamless cylindrical-sheet metal pump iston also formed with an integral hea suitable valve mechanism being employed for affecting the suction and discharge of the air. ac cordingto-re uirements; The c lin er 1 and iston construction herein disclosed: and c aimed is also disclosed .in another co-pending' application, Serial No 67 0,207 filed January 9, 1912. My invention further consists of a novel manner of assemblingthe piston members andother novel features; as will be herein? after particularly pointed out in the claims. It further consists. of other novel features of construction all as will be hereinafter fully set forth. I

For the purpose of illustrating :myv invention, ll have shown in the accompanying drawing one form thereof which is at pres ent preferred by me, since the. same hasv been found in practice to .give satisfactory and reliable results, although it is to be understood that the various instrumentalicmployedin detached osition Fig. 3 represents an end viewv .o the plston cylinder connecting r0 .drical-portion- 26,-;t e shoulder 27 an looking into the Sa m5, he sameshowing the.

construction of valve employed; .-.Fig. 4

represents a'sectlonon line w-m Fig. 3.

l s's "Similar numerals of reference ,indicate corresponding parts in thefigunes. N

.tReferring to the .drawings,: 1 designates the pum casing having thetop ortion 2 secured t ereto, the depending Sid Wall 5.

'26 designatesa-traction wheel adapted to runor travel upon the surface 7 of the carpet, rug .or floor to be cleaned, said wheel eing mounted on the shaft 8, havin suit-' able bearings (not shown) carried y the sides 3 of said casing. r v p 9 designates. a crank on'the shaft 8 carr ing the crank in lO-to which one end oft e 11 is secured, the" other end es 3, the forward end portions; and rear depending thereof being pivotally connected to the ears I 12 which have the ;threaded stem 13 projecting therefrom. I

The casing, traction ,wheel or... wheels, crank and connecting .rod and other 1 adjunctsmay be of theusualtype and 'asI make no 'claim per 86 to the same herein, no

further description thereofwill be necessary. a

ll adesignates the pistoncylinder, which I .is a cup-shaped seamless cylinder having the cylindrical portion 15 preferably drawn the integral head 16, secured to the wall 17, havingthe opening'l8 therein,.by brazing, soldermg .or other suitable means, said wall being secured to the member/l: by rivets or .or. stamped from sheet metal and having 25 designatesthe iston having thee linthe cylindrical portion 28 of reduced diameter,

terminatingin'thewall 29, said piston being drawn on stamped from sheet metal into seamless, c lindrical cup-shape the closed end or wal 29 being preferably. integral with the body portions 26 and 28.

3O designates a cup packing of indurate'd' fiber or similar. material secured to the closed end 29 and having the inturned flange 31 of substantially the same diameter as the portion 26. The flange 31 may be omitted,

if desired.

' g in addition.

The piston head, cup packing'and disk have registering openings 38 and the flexible, inwardly'openmg fla valve 39, secured upon the rear face of t e piston head 29 by the arm covers and controls the valve opening thus formed.

The operation is as follows :-It will be,

understood that the casing 2 and its adjuncts are propelled over the floor, car at, rug or other surface 7 which it is desired to clean and the contact of the traction wheel or wheels 6 therewith will cause the piston to be reciprocated within the piston chamber, whereupon the valves 20 and 39 familiar to those skilled in this art.

will alternately open and close in a manner It is a desideratum in these devices that y the same be ver light and practically noiseless and, in ad ition, it is essential that the same be operated, if possible, without lubrication in the piston cylinder, since in the use of the apparatus for cleanin carpets rugs, floors and the like, the mo ecules o dust which are liable to get in the piston H chamber will in a short time clog the same Y and b seamless sheet meta and cause the piston to stick if oil is used. I therefore employ the ackln' 30 of fiber the provision o the isks 32 and 34 whlch are held tightly assembled by the fastening devices common thereto, there is an entire absence of the rattling noise or vibration which frequently occurs in these devices and, in add1t-ion, I am enabled to dispense entirely with any lubrication withm the piston chamber.

By making the c linder and piston a drawn or stamped structure having an inte al head, the same can be produced very c eaply and will be extremely light, stron and durable and the apparatus can be readily transported from one room to another.

It will be understood that in ract-lce a pair of pumping cylinders and pistons are 32 designates an annular yielding gasket arranged .side by side and a lurality of traction wheels 6 are employe and a suction nozzle is employed in conjunction with a' pumping apparatus but as this per se forms no part of my invention, I have deemed it unnecessary to show' or describe the same in detail.

A great saving in weight and material is obtained by forming the piston and cylinder from sheet metal stamped or drawn into shape and a very slight amount of finishing of these parts is required, since the same are few and simple and are easy to assemble and dismantle'and can be readily removed for the purpose of inspection and repairs Without necessitating the employment of skilled labor. Furthermore, no lubrication of any of the moving parts is required, as the pistons have fiber cup packings constructed and assembled in the manner shown, said cup packings permitting the piston to. reciprocate in its cylinder without lubrication, while the gasket 32 of rubber or similar material interposed between the packing and metallic disk, as 34, which confines these parts, serves to deaden any rattling or other noise caused by the friction between the dry packing'and cylinders. The solder or abutment 37 upon the rear face of the piston head prevents the bolt or threaded stem 13 from turning, as is evident, while the screws 35 passing through the-disk, packing and piston head insure'the true almement of the valve ports or openings through the same preventing turning of said ports. I referably connect the connecting rod 11 w1th the ears 12 by means of a qotter-pin whlch farms an easy'assembled connection which can be as easily disconnected.

It will now be apparent that I have devised a novel and useful construction of a pum for vacuum cleaners, which embodies the eatures of advantage enumerated as desirable in the statement of the invention and the above description and while I have, in the resent instance, shown and described a pre erred embodiment thereof whlch has been found in practice to give satisfactory and reliable results, itis to be understood that the same is susceptible of modificat on in various particulars without departlng from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my lnventlon, what I claim as new and desire to secure by Letters Patent, is

1. In a vacuum cleaner, a seamless sheet metal um cylinder formed with an mtegral head a seamless cylindrical sheetmetal pump-piston formed with an integral end and having the portion at that end reduced in diameter to form a shoulder, a packing fitting upon said reduced portion, and means for securin such packing to the end of the'piston, sai means comprising a yielding gasket upon the outer face of said packing, a disk formed with an annular rib bearing against said gasket, and means for holding said packing and disk in assembled position.

2. In a vacuum cleaner, a seamless sheet metal pump cylinder formed with an integral head, a seamless cylindrical sheetmetal pump-piston formed with an integral end and having the portion at that end reduced indiameter to form a shoulder, a fiber cup-packing fitting upon said reduced portion, a circular sheet-metal disk, a yielding gasket interposed between said dlsk and packing and a bolt passed throughthe end of the piston, packing and disk and having a nut for drawing said parts together.

8. In avacuum cleaner, a pump-cylinder, a seamless cylindrical sheet-metal pumppiston formed with an integral end and having the portion at that end reduced in diameter to form a shoulder, a fiber cup-packing fitting upon said reduced portion, a yieldlng gasket upon the outer face of said packing, a circular sheet-metal disk formed with an annular rib bearing against said gasket,

and a bolt passed through the end of the piston, packing and disk and having a nut for drawing said parts together.

4;. In a vacuum cleaner, a seamless sheet metal pum cylinder formed with an integral head a seamless cylindrical sheet metal pump piston formed with an integral end, a packing fitted upon the integral end of said piston, a yielding gasket located against the outer face of said packing, an outer disk formed with an inner rib bearing against said gasket, and fastening devicescommon to said piston, packing and disk for securing the parts in assembled position.

5. In a vacuum cleaner, a seamless cylindrical sheet metal pump piston having a head thereon, a packing secured to the outer surface of said head, a yielding gasket u on the outer face of said packing, an outer 'sk formed with an annular rib bearing against said gasket, and fastening devices common to the end ofsaid piston',packing and disk for holding said parts in assembled position,

Witnesses:

E. HAYWARD FAIRBANKS, O. D. MoVAY. I

ROBERT RSMITH. 

